UNDERHOOD Junction Block
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2005 Pontiac Montana, 2005 Chevrolet Venture, 2004 Pontiac Montana, 2004 Oldsmobile Silhouette, and 2004 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Underhood junction block is located on the passenger's side of the vehicle, in front of the windshield washer fluid reservoir. See Fig 1.
UNDERHOOD FUSE BLOCK CIRCUIT IDENTIFICATION (2002)
| Maxi Fuse | Usage |
|---|---|
| 1 | Coolant Fans |
| 2 | Not Used |
| 3 | Circuit Breakers: Front Comfort Controls Hi Blower, and Headlamp Fuses (Instrument Panel): Hazard and Stoplamp |
| 4 | Circuit Breaker: Power Seat. Fuses (Instrument Panel): Electronic Level Control and Rear Defogger |
| 5 | Ignition Switch to Fuses (Instrument Panel): ABS/TCS Ignition, Cruise, DRL, Electronic PRNDL, Ignition 1, PSD, Air Bag, Turn Signal and Powertrain Control Module [IGN MAIN Relay (Underhood Fuse Block A/C Clutch, Electronic Ignition, Ignition 1-U/H, INJ, TCC)1 |
| 6 | Coolant Fans |
| 7 | Fuses (Instrument Panel): ABS Module Battery, Cigarette Lighter, Courtesy Lamps, Front Power Socket, Power Locks, Power Mirrors and Right Rear Power Socket |
| 8 | Ignition Switch to Fuses (I/P): Body Control Module Program, Front Comfort Controls Low/Medium Blower, Front Wiper/Washer, HVAC/DRL, MALL/Radio/DIC, Power Quarter Vent, Rear HVAC, Rear Wiper/Washer. SWC Accessory and Power Window Circuit Breaker |
| Mini Relays | Usage |
| 9 | Right Fan 1, Left Fan 2 Relay |
| 10 | Left Fan 2 |
| 11 | Fuses: A/C Clutch, Ignition 1 -U/H, INS, Electronic Ignition Relay, TCCRelay |
| 12 | Right Fan 1, Left Fan 2 |
| Micro Relays | Usage |
| 13 | A/C Clutch Relay |
| 14 | Fuel Pump Relay |
| 15 | Not Used |
| 16 | Horn Relay |
| 17 | Left Fog Lamp, Right Fog Lamp Relay, Fog Lamp Indicator |
| Mini Fuse | Usage |
| 18 | Fuel Injectors 1 -6 |
| 19 | Not Used |
| 20 | Not Used |
| 21 | Evaporative Emissions (EVAP) Canister Purge Valve, Heated Oxygen Sensors 1 and 2, Mass Air Flow (MAF) Sensor |
| 22 | Not Used |
| 23 | Not Used |
| 24 | Not Used |
| 25 | Ignition Control Module (ICM) |
| 26 | Not Used |
| 27 | Transaxle Range Switch to Back-up Lamps |
| 28 | A/C Clutch Relay to A/C Compressor Clutch Oil |
| 29 | Driver Information Display, Heater A/C Control, Radio, Rear Side Door Actuator Control Motor, Remote Control Door Lock Receiver (RCDLR), Security Indicator Lamp and Theft-Deterrent Shock Sensor |
| 30 | Generator |
| 31 | Automatic Transaxle (Torque Converter Clutch Solenoids) Stoplamp Switch to Powertrain Control Module |
| 32 | Fuel Pump Relay |
| 33 | Powertrain Control Module |
| 34 | Radio |
| 35 | Fog Lamp Relay |
| 36 | Horn Relay |
| 37 | Daytime Running Lamps (DRL) Control Module, Headlamps and Instrument Panel Dimmer Switch Theft-Deterrent Relay to Headlamps |
| 38 | Not Used |
| 39 | AIR |
| Diodes | |
| Air Conditioning Clutch Diode | |
| 40 | Mini Fuse Puller |
UNDERHOOD FUSE BLOCK CIRCUIT IDENTIFICATION (2003-05) (1 Of 3)
| Fuse | Usage |
| 1 | Coolant Fans |
| 2 | Not Used |
| 3 | Circuit Breakers: Front Comfort Controls Hi Blower, and Headlamp Fuses (Instrument Panel): Hazard and Stoplamp, PASS-Key |
| 4 | Circuit Breaker: Power Seat and Power Sliding Door. Fuses (Instrument Panel): Electronic Level Control and Rear Defogger, Trailer, Fog Lamps |
| 5 | Ignition Switch to Fuses (Instrument Panel): ABS/TCS Ignition, Cruise, DRL, Electronic PRNDL, Ignition 1, AWD, PSD, Air Bag, Turn Signal and Powertrain Control Module [IGN MAIN Relay (Underhood Fuse Block: A/C Clutch, Electronic Ignition, Ignition 1-U/H, INJ, TCC)] |
| 6 | Coolant Fans |
| 7 | Fuses (Instrument Panel): ABS Module Battery, Cigarette Lighter, Courtesy Lamps, Front Power Socket, Power Locks, Power Mirrors and Right Rear Power Socket, OnStar, RAP |
| 8 | Ignition Switch to Fuses (I/P): Body Control Module Program, Front Comfort Controls Low/Medium Blower, Front Wiper/Washer, HVAC/DRL, MALL/Radio/DIC, Power Quarter Vent, Rear HVAC, Rear Wiper/Washer. SWC Accessory and Power Window Circuit Breaker, RAP |
| 18 | Fuel Injectors 1-6 |
| 19 | Not Used |
| 20 | Not Used |
| 21 | Evaporative Emissions (EVAP) Canister Purge Valve, Heated Oxygen Sensors 1 and 2, Mass Air Flow (MAF) Sensor |
| 22 | Not Used |
| 23 | Not Used |
| 24 | Not Used |
| 25 | Ignition Control Module (ICM) |
| 26 | Not Used |
| 27 | Transaxle Range Switch to Back-up Lamps |
| 28 | A/C Clutch Relay to A/C Compressor Clutch Oil |
| 29 | Driver Information Display, Heater A/C Control, Radio, Rear (LH and RH) Side Door Actuator Control Motor, Remote Control Door Lock Receiver (RCDLR), Security Indicator Lamp and Theft-Deterrent Shock Sensor |
| 30 | Generator |
| 31 | Automatic Transaxle (Torque Converter Clutch Solenoids) Stoplamp Switch to Powertrain Control Module |
| 32 | Fuel Pump Relay |
| 33 | Powertrain Control Module |
| 34 | Not Used |
| 35 | Fog Lamp Relay |
| 36 | Horn Relay |
| 37 | Daytime Running Lamps (DRL) Control Module, Headlamps and Instrument Panel Dimmer Switch Theft-Deterrent Relay to Headlamps |
| 38 | Not Used |
| 39 | AIR |
UNDERHOOD FUSE BLOCK CIRCUIT IDENTIFICATION (2003-05) (2 Of 3)
| Fuse | Usage |
|---|---|
| 40 | Mini Fuse Puller |
| Air Conditioning Clutch Diode |
UNDERHOOD FUSE BLOCK CIRCUIT IDENTIFICATION (2003-05) (3 Of 3)
| Relay | Usage |
|---|---|
| 9 | Right Fan 1, Left Fan 2 |
| 10 | Left Fan 2 |
| 11 | Fuses: A/C Clutch, Ignition 1-U/H, Electronic Ignition, TCC, Injectors |
| 12 | Right Fan 1, Left Fan 2 |
| 13 | A/C Clutch |
| 14 | Fuel Pump |
| 15 | Not Used |
| 16 | Horn |
| 17 | Left Fog Lamp, Right Fog Lamp, Fog Lamp Indicator |